// Configuration
#define POT_PIN A0
#define OUT_PIN 9
#define NUM_READINGS 100
#define CALIBRATION_TIME 5000  // 5 seconds for simulation

// Global state
struct {
  int min = 1023;
  int max = 0;
  bool done = false;
  unsigned long startTime;
} calibration;

int readings[NUM_READINGS];
int readIndex = 0;
long total = 0;
float sensitivity = 0.8;  // More noticeable for simulation

void setup() {
  Serial.begin(115200);  // Faster for simulator
  pinMode(OUT_PIN, OUTPUT);
  
  calibration.startTime = millis();
  int initial = getSmoothedReading();
  
  for(int i=0; i<NUM_READINGS; i++) {
    readings[i] = initial;
  }
  total = initial * NUM_READINGS;
}

void loop() {
  if (!calibration.done) {
    handleCalibration();
  } else {
    handleNormalOperation();
  }
}

void handleCalibration() {
  int raw = analogRead(POT_PIN);
  
  calibration.min = min(calibration.min, raw);
  calibration.max = max(calibration.max, raw);

  Serial.print("CALIBRATING ");
  Serial.print(raw);
  Serial.print(" ");
  Serial.print(calibration.min);
  Serial.print(" ");
  Serial.println(calibration.max);

  if (millis() - calibration.startTime > CALIBRATION_TIME) {
    calibration.done = true;
    Serial.println("CALIBRATION_COMPLETE");
  }
  delay(50);
}

void handleNormalOperation() {
  int raw = analogRead(POT_PIN);
  updateRunningAverage(raw);
  int avg = total / NUM_READINGS;
  
  int pwm = map(constrain(avg, calibration.min, calibration.max), 
               calibration.min, calibration.max, 0, 255);
  
  analogWrite(OUT_PIN, pwm);

  // Simulator-friendly output
  Serial.print("INPUT:");
  Serial.print(raw);
  Serial.print(",AVG:");
  Serial.print(avg);
  Serial.print(",PWM:");
  Serial.println(pwm);
  
  delay(20);
}

void updateRunningAverage(int newReading) {
  total -= readings[readIndex];
  total += newReading;
  readings[readIndex] = newReading;
  readIndex = (readIndex + 1) % NUM_READINGS;
}

int getSmoothedReading() {
  // Initial smoothing for simulation stability
  int sum = 0;
  for(int i=0; i<10; i++) {
    sum += analogRead(POT_PIN);
    delay(1);
  }
  return sum/10;
}